Software Update: Mozilla Thunderbird 78.9.1

The Mozilla Foundation has released version 78.9.1 of Thunderbird. Thunderbird is an open source client for e-mail and newsgroups, with features such as support for various mail and news accounts, a spam filter, spell checker and a customizable appearance. In version 78, a dark mode has been added and other parts of the interface, such as the icons and the screen for composing an email, have also been overhauled. Furthermore, the Lightning calendar add-on is now a standard part of the program, there is a new wizard for the first use and only MailExtensions add-ons are supported. The changelog for this release looks like this:


  • Support recipient aliases for OpenPGP encryption. Documentation can be found here.


  • The key and signature parts of the message security popup on a received message could not be selected for copy/paste.
  • Various UX and theme improvements
  • Various security fixes

Version number 78.9.1
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Mozilla Foundation
License type GPL